Dynamo cooling system



July 28, 1931. H. H. WAIT DYNAMO COOLING SYSTEM Filed March 3, 192 3 Sheets-Sheet l July 28, 1931'. H. .H. WAIT DYNAMO COOLING SYSTEM 3 Sheets-Sheet 2 Filed March 3, 192'7 July 28, 1931. H. H. WAIT DYNAMO COOLING SYSTEM Filed March 5, 1927 5 Sheets-Sheet 3 Patented July 28, 1931 UNITED STATES HENRY H. WAIT, OF CHESTERTON, INDIANA DYNAMO COOLING SYSTEM Application filed March 3,

This invention relates to dynamo cooling systems'in general and has for its object the provision of an improved dynamo construc tion and cooling means therefor.

. An object oft-his invention is to provide in a system of a dynamo a separator situated at the inlet for the air for removing the dirt and other foreign matter from the air admitted to the system.

Another objectof this invention is to provide a cooling system for dynainos wherein the cooling air is circulated not only around the exterior of the armature and the core pieces but alsoin the interior of said armature around the inner parts ofthe core and armature coils.-

Other and further objects of this invention will be apparent as the same becomes better understood from an examination of the specaoification and claims in connection with the accompanying drawings wherein,

Fig. 1 is a fragmentary longitudinal view in section and with parts in elevation show ing the generator end of a turbine generator ES-embodying this invention.

Fig. 2 is an enlarged fragmentary detail view partly in section of the armature and parts associated therewithwhich form a part of' the cooling system.

Fig. 3 is an enlarged detail view showing the end of the armature sleeve removed.

Fig. 4 is an enlarged end view of the fan.

Fig. 5 is a side view of Fig. 4.

Fig. 6 is a View from the opposite side of Fig. 4 showinga supporting drum integral with the fan, the drum forming a part of the armature for supporting the coils thereof and also forming a part of the cooling system.

Fig. 7 is an enlarged detail view of the other of the supporting drums for the armature coils, the drum also forming a part of the cooling system.

Fig. 8 is a side view of Fig. 7.

Referring to the drawings more particularly, the armature in this embodiment is mounted in a housing which includes a hollow cylindrical section 1 joined at one end by extensions 2 which are integral with the tur bine housing more particularly described in the co-pending application for a turbine conconnection with the cooling Iii) 192?. Serial No. 172,261.

struction of Louis H. Morrill, Serial No. 172,291, filed March 3, 1927. The extensions 2 are provided with an integral annular portion 3 which fits in the left end of section 1 as viewed in Fig. 1.

The portion 3 is cast to provide an integral inwardly extending annular flange 3a surrounding the turbogenerator shaft leaving a central opening 36 through which air is admitted to the interior of said portion. Beyond the flange 3a the portion 3 is provided with an annular shoulder 30 to which is bolted an annular disk 4: forming a separator chamber with the interior of said portion and provided with a central air outlet opening 18 around the turbo-generator shaft. Spaced from the disk 4 and carried thereby by integral webs 4a is a baffle plate 19 which is apertured to accommodate the turbo-generator shaft. The edges of the plate 19 over lap the edges both of the openings 3?) and 18 providing high Velocity annular passages ll) and 40 separated by a low velocity annular space aid to which is delivered minute particles of dirt and other foreign matter which might be drawn in through the opening 3?). In order to prevent the accumulation of sediment thus delivered to the space 1d and to provide an outlet for such sediment an opening leis provided in the bottom of the portion 3 communicating between the exterior thereof and the bottom of said space. The housing for the generator further includes a yoke 6 mounted over the right end of the section 1 and a cover 7 covering the said yoke and substantially closing the right end of the housing. The cover 7 may be hinged as by pins 8 in lugs 9 integral with the upper outer edge of the yoke 6. A thumb screw 10 may be journaled in the cover 7 and provided with an inwardly extending screw portion 11 threaded into the yoke 6 for securing said cover in closed position. The cover 7 is struck outwardly to provide a plurality of transverse parallel louvres 12 and openings therebeneath to permit air to be discharged from the generator housin An armature 15 forming a part of the generator is operatively mounted within the housing on the shaft 13, the latter being suitably supported at the left end, as for instance, in the turblne houslng (not shown) in a manner such as 1s 1llustrated and described in connection with the above co-pending application and at the right end by a ball hearing unit 14. which suitably mounted in the yoke 6. The armature indicated generally by the numeral is longitudinally positioned on the shaft 13 opposite pole pieces 16 which are suitably secured in angularly spaced positions within the section 1 and are provided with suitable coils 17.

The plate 4 is provided with acentral opening 18 therein surrounding the shaft 13 which permits air to enter the housing and is also provided with a vertical baffle plate 19 which is spaced outwardly from said plate 4: and apertured to accommodate the shaft 13. The edges of the plate 19 overlap the edges of the opening 18 so that minute particles in the air which are drawn through said opening will fall either outside of said plate or between the same and the plate 4:.

The air is drawn in through the opening 18 by means of a fan which includes an aunular member indicated by the numeral 20 and formed in the shape illustrated more particularly in Figs. 4i and The fan mem ber 20 is provided with a plurality of angularly spaced blades 21 adjacent its outer periphery and adapted to drive air radially through openings 22 and to draw air axially through an intake 23 communicating with the opening 18. The fan member 20 is rigidly secured on the left end. of cylindrical armature sleeve 2 as vie ed in Fig. 2. Said sleeve 24: provided with a plurality of 'angularly spaced axially extending grooves 25 in the outer periphery thereof. The grooves 25 are provided at each of their re spective left ends with a deflected or helical portion 26 so that upon the rotation of the sleeve 2%, air will be drawn into said grooves, said helical portions 26 acting as air impelling means. Thus the fan in its broadest sense includes not only the blades but also the helical portions 26 of the grooves 25 which are in effect also blades.

The fan member 20 has a sleeve portion 27 integral therewith together with a drum surrounding said sleeve portion at the end thereof opposite to said fan. The drum 28 is connected to the sleeve 27 by a plurality of angularly spaced radial integral webs 29.

The armature core 30 consists of a plu rality 01' CllSh'S also rigidly secured on the sleeve 25 to the right of the drum 28 viewed in Fig. 2.

A second drum 31 is rigidly secured on the sleeve 2 1 to the ri ht of the core 30. The armature coils 82 are suitably wound over the core 80 and the supporting drums 2S and 31 and are connected in a suitable manner to the commutator 33 which is mount d on a cylindrical extension 84 on the right of the sleeve 24:. The commutator 38 is held on the extension S l in engagement with a shoulder 35 by a nut 36 threaded on said extension.

The sleeve 24; may be connected to the shaft 13 for rotation therewith in any suitable manner but preferably as shown more particularly in the copending application of Harry P. Bayley for armature drive, Serial No. 171,324, filed February 25, 1927.

he sleeve 27 is provided with a plurality of apertures 3'? to provide communication between the interior of the drum 28 and each groove 25 and said drums are cut away adjacent the core 30 between each of the webs 29, as at 38, in order that air which is drawn through the grooves 25 may pass through the apertures 37 and recesses 38 to cool the core 30, the coils and. associated parts. The supporting drum Si is also provided. with a. plurality of angzularly spaced radially extending integral webs 39 on the inner face of said menihers which act to space said drum from the core 30 and form with said core and drum passages communicating with the grooves 25 to permit the passage of air from said grooves upwardly along the right end of said core and outwardly through the coils 32.

The pressure created within the generator housing by the air discharged from the openings will cause said air together with the discharge from the grooves 25 to flow outvardly through the louvres 12 at the right end of said housing.

The bottom of each of the grooves 25 at the right end thereof is curved outwardly as at 110 so that the air may be discharged from said ends outwardly through the coils 32 to the right of the drum 31.

it will be obvious to those skilled in the art that the aforedescribed system will officiently cool not only the exterior of the armature and the pole pieces but will also very efl iciently cool the interior of said armature.

I am aware that many changes may be made without departiin from the principles of this invention and i do not wish to be limited to the details described.

I claim:

1. In a dynamo, the combination of a 1'0- tatable shaft, a sleeve rigidly secured thereon, and an armature core mounted on said sleeve for rotation therewith, said sleeve being provided with longitudinal grooves forming air passages for cooling said core and provided also with a fan having one blade for each groove, said blade being in eiiect axially inclined for forcing air longitudinally through the respective groove.

2. In a dynamo the combination of a cas ing for said dynamo provided with an air opening for delivering air to said dynamo, with forced draft means within said casing for drawing air through said opening and cooling said dynamo, said casing being provided with an air passage connecting said opening and means, said passage having a relatively low velocity portion for precipitating solid particles drawn in through said opening and a drain in said low velocity portion.

3. In a dynamo, the combination of a ca ing for said dynamo provided with an air opening for delivering air to said dynamo, and forced draft means within said casing for drawing air through said opening and cooling said dynamo, said casing being provided with an air passage connecting said opening and means, said passage having a low velocity section and a high velocity section on each side of said lowvelocity section for causing the precipitation in the first section of particles drawn in through said opening.

4. In a dynamo, the combination of a rotatable shaft, a sleeve rigidly secured there on, and an armature core mounted on said sleeve for rotation therewith, said sleeve being provided with a plurality of longitudinal grooves spaced about its periphery and forming air passages for cooling said core, the walls of said grooves at one end of the sleeve being axially inclined to form fan blades for forcing air longitudinally through the grooves.

5. In a dynamo, a rotatable shaft, a sleeve on said shaft, an armature carried by said sleeve, said sleeve being provided with a plurality of axial passages and also being provided with a fan for directing air into said passages and a second fan positioned intermediate the ends of said passages for drawing air therethrough.

6. In a dynamo, the combination of a casing for said dynamo provided with an air opening for delivering air to said dynamo, means within said casing for circulating air through said opening to cool said dynamo, said casing being provided with an air passage connecting said opening and said means, said passage having a relatively low velocity portion for precipitating solid particles drawn through said opening and means in the low velocity portion for removing particles from said low velocity portion.

'7. In a dynamo, the combination of a casing for said dynamo provided with an air opening for delivering air to said dynamo, means within said casing for forcing air through. said opening to cool said dynamo, said casing being provided with an air passage connecting said opening and said means, said passage having a relatively low velocity portion for precipitating solid particles drawn through said opening, said casing having an opening leading from the exterior to a point of lowest velocity in said low pressure chamber for permitting particles collected therein to be removed.

8. In a dynamo, the combination of a casing for said dynamo provided with an air opening for delivering air to said dynamo, means within said casing for forcing air through said opening and cooling said dynamo, said casing being provided with an air passage connecting said opening and said means, said passage having a relatively low velocity portion out of the direct path of the high velocity air for precipitating solid particles drawn through said opening.

9. In a dynamo, the combination of a casing for said dynamo provided with an air opening for delivering air to said dynamo, means within said casing for forcing air through said opening and cooling said dynamo, said casing being provided with an air passage connecting said opening and said means, said passage including a separating chamber having a baffle wall therein and a relatively low velocity passage directly opposite the end of said wall.

10. In a dynamo, the combination of a rotatable shaft, a rotor thereon, the rotor being provided with axial passages therein for circulating air therethrough, and with an tornal fan associated with said passages for impelling air longitudinally through said passages the blades of said fan being axially inclined, and a second internal fan on said shaft provided with centrifugal blades disposed intermediate the ends of the passages in said rotor and arranged to withdraw air from said passages.

11. In a dynamo, the combination of a rotatable shaft, a rotor thereon, a stator disposed radially of said rotor, a casing for the dynamo provided with a central air opening leading directly to the exterior and constituting a source of fresh air, a fan arranged to deliver air to the rotor and a separate fan for delivering air to the stator both fans being mounted on said shaft and having their inlets in direct communication with said opening and arranged to receive fresh air directly from said opening and a velocity type separator in said opening at a point between the discharge of said opening and the inlets to said fans arranged to prevent foreign matter in the air from passing into said fan.

12. In a dynamo, the combination of a shaft. a rotor thereon, a stator disposed radially of said rotor with a centrifugal fan on said shaft provided with blades for delivering cooling air to said stator, a helical fan on said shaft for directing air into said rotor and a third fan of centrifugal type in series with said helical fan and arranged to receive air from said helical fan and force the air therefrom through said rotor.

13. In a dynamo, the combination of a shaft, a rotor thereon, a stator disposed radially of said rotor and a casing surrounding said stator, said casing having a central opening therein leading to the exterior, with a cei'ltrifugal fan on said shaft provided With blades for delivering cooling air to said stator, a helical fan on said shaft for directiug air into said rotor and a third fan of the centrifugal type in series with said helical fan arranged to receive air from said helical fan for forcing the air thus received through saidrotor, the intakes of said first mentioned centrifugal fan and said helical fan being connected directly to said opening for receivin g fresh air therefrom.

14:. In a dynamo, the combination of a shaft, a rotor thereon, a stator disposed radially of said rotor and a casing surrounding said stator, said casing having a central opening therein leading to the exterior, With a centrifugal fan on said shaft provided with blades for delivering cooling air to said stator, a helical fan on said shaft for directing air into said rotor a third fan of the centrifugal type in series With said helical fan arranged to receive air from said helical fan for forcing the air thus received through said rotor, the intakes of said first mentioned centrifugal fan and said helical fan being connected directly to said opening for rereceiving fresh air therefrom and a velocity type separator in said opening between the discharge end thereof and the inlets to said fans.

In witness of the foregoing I affix my sig nature.

HENRY H. WAIT. 

